<SEC-DOCUMENT>0001144204-13-011009.txt : 20130225
<SEC-HEADER>0001144204-13-011009.hdr.sgml : 20130225
<ACCEPTANCE-DATETIME>20130225171427
ACCESSION NUMBER:		0001144204-13-011009
CONFORMED SUBMISSION TYPE:	SC 13D/A
PUBLIC DOCUMENT COUNT:		1
FILED AS OF DATE:		20130225
DATE AS OF CHANGE:		20130225

SUBJECT COMPANY:	

	COMPANY DATA:	
		COMPANY CONFORMED NAME:			CLEARSIGN COMBUSTION CORP
		CENTRAL INDEX KEY:			0001434524
		STANDARD INDUSTRIAL CLASSIFICATION:	INDUSTRIAL INSTRUMENTS FOR MEASUREMENT, DISPLAY, AND CONTROL [3823]
		IRS NUMBER:				000000000
		STATE OF INCORPORATION:			WA

	FILING VALUES:
		FORM TYPE:		SC 13D/A
		SEC ACT:		1934 Act
		SEC FILE NUMBER:	005-86820
		FILM NUMBER:		13639993

	BUSINESS ADDRESS:	
		STREET 1:		12870 INTERURBAN AVENUE SOUTH
		CITY:			SEATTLE
		STATE:			WA
		ZIP:			98168
		BUSINESS PHONE:		(206) 673-4848

	MAIL ADDRESS:	
		STREET 1:		12870 INTERURBAN AVENUE SOUTH
		CITY:			SEATTLE
		STATE:			WA
		ZIP:			98168

FILED BY:		

	COMPANY DATA:	
		COMPANY CONFORMED NAME:			MARLETT CHRISTOPHER A
		CENTRAL INDEX KEY:			0000897744

	FILING VALUES:
		FORM TYPE:		SC 13D/A

	MAIL ADDRESS:	
		STREET 1:		100 WILSHIRE BLVD
		CITY:			SANTA MONICA
		STATE:			CA
		ZIP:			90401
</SEC-HEADER>
<DOCUMENT>
<TYPE>SC 13D/A
<SEQUENCE>1
<FILENAME>v336186_sc13d-a.htm
<DESCRIPTION>SCHEDULE 13D/A
<TEXT>
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<P STYLE="font: 10pt Times New Roman, Times, Serif; margin-top: 0pt; margin-bottom: 0pt; text-align: center"><B>SECURITIES AND EXCHANGE COMMISSION</B><BR>
WASHINGTON, D.C. 20549</P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin-top: 0pt; margin-bottom: 0pt; text-align: center">&nbsp;</P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin-top: 0pt; margin-bottom: 0pt; text-align: center"><B>SCHEDULE 13D/A</B></P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin-top: 0pt; margin-bottom: 0pt; text-align: center"><B>(Rule 13d-101)</B></P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin-top: 0pt; margin-bottom: 0pt; text-align: center">&nbsp;</P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin-top: 0pt; margin-bottom: 0pt; text-align: center"><B>INFORMATION TO BE INCLUDED IN STATEMENTS
FILED PURSUANT TO RULE</B></P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin-top: 0pt; margin-bottom: 0pt; text-align: center"><B>13D-1(a) AND AMENDMENTS THERETO FILED PURSUANT TO RULE 13D-2(a)</B></P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin-top: 0pt; margin-bottom: 0pt; text-align: center">&nbsp;</P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin-top: 0pt; margin-bottom: 0pt; text-align: center"><B>(Amendment No. 3)</B></P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin-top: 0pt; margin-bottom: 0pt; text-align: center"><B>&nbsp;</B></P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin-top: 0pt; margin-bottom: 0pt; text-align: center"><B>ClearSign Combustion Corporation</B><FONT STYLE="font-size: 10pt">
</FONT><BR>
<FONT STYLE="font-size: 10pt">(Name of Issuer)</FONT></P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin-top: 0pt; margin-bottom: 0pt; text-align: center">&nbsp;</P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin-top: 0pt; margin-bottom: 0pt; text-align: center"><B>Common Stock</B><BR>
(Title of Class of Securities)</P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin-top: 0pt; margin-bottom: 0pt; text-align: center">&nbsp;</P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin-top: 0pt; margin-bottom: 0pt; text-align: center"><B>185064102</B></P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin-top: 0pt; margin-bottom: 0pt; text-align: center">(CUSIP Number)</P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin-top: 0pt; margin-bottom: 0pt; text-align: center">&nbsp;</P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin-top: 0pt; margin-bottom: 0pt; text-align: center"><B>Andrew D. Hudders, Esq.</B></P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin-top: 0pt; margin-bottom: 0pt; text-align: center"><B>Golenbock Eiseman
Assor Bell &amp; Peskoe LLP, </B></P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin-top: 0pt; margin-bottom: 0pt; text-align: center"><B>437 Madison Avenue, New York, New York
10022 </B></P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin-top: 0pt; margin-bottom: 0pt; text-align: center"><B>(212-907-7300)</B></P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin-top: 0pt; margin-bottom: 0pt; text-align: center"><B></B>
(Name, Address and Telephone Number of Person Authorized<BR>
to Receive Notices and Communications)</P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin-top: 0pt; margin-bottom: 0pt; text-align: center">&nbsp;</P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin-top: 0pt; margin-bottom: 0pt; text-align: center"><B>February 25, 2013</B><BR>
(Date of Event which Requires Filing of this Statement)</P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-align: center">&nbsp;</P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0">If the filing person has previously filed a statement on Schedule
13G to report the acquisition that is the subject of this Schedule 13D, and is filing this schedule because of Rule 13d-1(b)(3)
or (4), check the following box. <FONT STYLE="font-family: Wingdings">&#168;</FONT></P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0">&nbsp;</P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0"><B>Note</B>: Schedules filed in paper format shall include a
signed original and five copies of the schedule, including all exhibits. See &sect;240.13d-7 for other parties to whom copies are
to be sent.</P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0">&nbsp;</P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0">* The remainder of this cover page shall be filled out for a
reporting person&rsquo;s initial filing on this form with respect to the subject class of securities, and for any subsequent amendment
containing information which would alter disclosures provided in a prior cover page.</P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0">&nbsp;</P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0">The information required on the remainder of this cover page
shall not be deemed to be &ldquo;filed&rdquo; for the purpose of Section 18 of the Securities Exchange Act of 1934 (&ldquo;Act&rdquo;)
or otherwise subject to the liabilities of that section of the Act but shall be subject to all other provisions of the Act (however,
see the Notes).</P>



<P STYLE="margin: 0"></P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0">&nbsp;</P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0"><B>&nbsp;&nbsp;</B></P>

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<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0"></P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0">&nbsp;</P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0">CUSIP NO.: 185064102</P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0">&nbsp;</P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0"></P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0"></P>

<TABLE CELLSPACING="0" CELLPADDING="0" STYLE="font: 10pt Times New Roman, Times, Serif; width: 100%">
<TR>
    <TD STYLE="border-top: black 1pt solid"><FONT STYLE="font: 10pt Times New Roman, Times, Serif">1.</FONT></TD>
    <TD COLSPAN="2" STYLE="border-top: black 1pt solid"><FONT STYLE="font: 10pt Times New Roman, Times, Serif">NAME OF REPORTING PERSON</FONT></TD></TR>
<TR>
    <TD STYLE="width: 5%">&nbsp;</TD>
    <TD STYLE="width: 88%">&nbsp;</TD>
    <TD STYLE="width: 7%">&nbsp;</TD></TR>
<TR>
    <TD STYLE="border-bottom: black 1pt solid">&nbsp;</TD>
    <TD COLSPAN="2" STYLE="border-bottom: black 1pt solid"><FONT STYLE="font: 10pt Times New Roman, Times, Serif">Christopher Marlett&#9;&nbsp;</FONT></TD></TR>
<TR>
    <TD><FONT STYLE="font: 10pt Times New Roman, Times, Serif">2.</FONT></TD>
    <TD><FONT STYLE="font: 10pt Times New Roman, Times, Serif">CHECK THE APPROPRIATE BOX IF A MEMBER OF A GROUP</FONT></TD>
    <TD>&nbsp;</TD></TR>
<TR>
    <TD>&nbsp;</TD>
    <TD>&nbsp;</TD>
    <TD><FONT STYLE="font: 10pt Times New Roman, Times, Serif">(a)&nbsp;&nbsp;</FONT><FONT STYLE="font-family: Wingdings 2">&pound;</FONT></TD></TR>
<TR>
    <TD>&nbsp;</TD>
    <TD>&nbsp;</TD>
    <TD><FONT STYLE="font: 10pt Times New Roman, Times, Serif">(b)&nbsp;&nbsp;</FONT><FONT STYLE="font-family: Wingdings">x</FONT></TD></TR>
<TR>
    <TD STYLE="border-bottom: black 1pt solid">&nbsp;</TD>
    <TD STYLE="border-bottom: black 1pt solid">&nbsp;</TD>
    <TD STYLE="border-bottom: black 1pt solid">&nbsp;</TD></TR>
<TR>
    <TD><FONT STYLE="font: 10pt Times New Roman, Times, Serif">3.</FONT></TD>
    <TD><FONT STYLE="font: 10pt Times New Roman, Times, Serif">SEC USE ONLY</FONT></TD>
    <TD>&nbsp;</TD></TR>
<TR>
    <TD>&nbsp;</TD>
    <TD>&nbsp;</TD>
    <TD>&nbsp;</TD></TR>
<TR>
    <TD STYLE="border-bottom: black 1pt solid">&nbsp;</TD>
    <TD STYLE="border-bottom: black 1pt solid">&nbsp;</TD>
    <TD STYLE="border-bottom: black 1pt solid">&nbsp;</TD></TR>
<TR>
    <TD><FONT STYLE="font: 10pt Times New Roman, Times, Serif">4.</FONT></TD>
    <TD><FONT STYLE="font: 10pt Times New Roman, Times, Serif">SOURCE OF FUNDS</FONT></TD>
    <TD>&nbsp;</TD></TR>
<TR>
    <TD>&nbsp;</TD>
    <TD>&nbsp;</TD>
    <TD>&nbsp;</TD></TR>
<TR>
    <TD STYLE="border-bottom: black 1pt solid">&nbsp;</TD>
    <TD STYLE="border-bottom: black 1pt solid"><FONT STYLE="font: 10pt Times New Roman, Times, Serif">OO</FONT></TD>
    <TD STYLE="border-bottom: black 1pt solid">&nbsp;</TD></TR>
<TR>
    <TD><FONT STYLE="font: 10pt Times New Roman, Times, Serif">5.</FONT></TD>
    <TD><FONT STYLE="font: 10pt Times New Roman, Times, Serif">CHECK BOX IF DISCLOSURE OF LEGAL PROCEEDINGS IS REQUIRED PURSUANT TO ITEMS 2(d) or 2(e)</FONT></TD>
    <TD><FONT STYLE="font: 10pt Wingdings 2">&pound;</FONT><FONT STYLE="font-family: Times New Roman, Times, Serif">&nbsp;</FONT></TD></TR>
<TR>
    <TD>&nbsp;</TD>
    <TD>&nbsp;</TD>
    <TD>&nbsp;</TD></TR>
<TR>
    <TD STYLE="border-bottom: black 1pt solid">&nbsp;</TD>
    <TD STYLE="border-bottom: black 1pt solid">&nbsp;</TD>
    <TD STYLE="border-bottom: black 1pt solid">&nbsp;</TD></TR>
<TR>
    <TD><FONT STYLE="font: 10pt Times New Roman, Times, Serif">6.</FONT></TD>
    <TD><FONT STYLE="font: 10pt Times New Roman, Times, Serif">CITIZENSHIP OR PLACE OF ORGANIZATION&nbsp;</FONT></TD>
    <TD>&nbsp;</TD></TR>
<TR>
    <TD>&nbsp;</TD>
    <TD>&nbsp;</TD>
    <TD>&nbsp;</TD></TR>
<TR>
    <TD STYLE="border-bottom: black 1pt solid">&nbsp;</TD>
    <TD STYLE="border-bottom: black 1pt solid"><FONT STYLE="font: 10pt Times New Roman, Times, Serif">United States&nbsp;</FONT></TD>
    <TD STYLE="border-bottom: black 1pt solid">&nbsp;</TD></TR>
</TABLE>
<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0"></P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0"></P>

<TABLE CELLSPACING="0" CELLPADDING="0" STYLE="font: 10pt Times New Roman, Times, Serif; width: 100%">
<TR>
    <TD STYLE="width: 19%; text-align: left">&nbsp;</TD>
    <TD STYLE="width: 5%"><FONT STYLE="font: 10pt Times New Roman, Times, Serif">7.</FONT></TD>
    <TD STYLE="width: 69%"><FONT STYLE="font: 10pt Times New Roman, Times, Serif">SOLE VOTING POWER</FONT></TD>
    <TD STYLE="width: 7%">&nbsp;</TD></TR>
<TR>
    <TD STYLE="text-align: left"><FONT STYLE="font: 10pt Times New Roman, Times, Serif">NUMBER OF</FONT></TD>
    <TD>&nbsp;</TD>
    <TD>&nbsp;</TD>
    <TD>&nbsp;</TD></TR>
<TR>
    <TD STYLE="text-align: left"><FONT STYLE="font: 10pt Times New Roman, Times, Serif">SHARES</FONT></TD>
    <TD STYLE="border-bottom: black 1pt solid">&nbsp;</TD>
    <TD STYLE="border-bottom: black 1pt solid"><FONT STYLE="font: 10pt Times New Roman, Times, Serif">273,349<SUP>1</SUP></FONT></TD>
    <TD STYLE="border-bottom: black 1pt solid">&nbsp;</TD></TR>
<TR>
    <TD STYLE="text-align: left"><FONT STYLE="font: 10pt Times New Roman, Times, Serif">BENEFICIALLY</FONT></TD>
    <TD><FONT STYLE="font: 10pt Times New Roman, Times, Serif">8.</FONT></TD>
    <TD><FONT STYLE="font: 10pt Times New Roman, Times, Serif">SHARED VOTING POWER</FONT></TD>
    <TD>&nbsp;</TD></TR>
<TR>
    <TD STYLE="text-align: left"><FONT STYLE="font: 10pt Times New Roman, Times, Serif">OWNED BY</FONT></TD>
    <TD>&nbsp;</TD>
    <TD>&nbsp;</TD>
    <TD>&nbsp;</TD></TR>
<TR>
    <TD STYLE="text-align: left"><FONT STYLE="font: 10pt Times New Roman, Times, Serif">EACH</FONT></TD>
    <TD STYLE="border-bottom: black 1pt solid">&nbsp;</TD>
    <TD STYLE="border-bottom: black 1pt solid"><FONT STYLE="font: 10pt Times New Roman, Times, Serif">537,618<SUP>2</SUP></FONT></TD>
    <TD STYLE="border-bottom: black 1pt solid">&nbsp;</TD></TR>
<TR>
    <TD STYLE="text-align: left"><FONT STYLE="font: 10pt Times New Roman, Times, Serif">REPORTING</FONT></TD>
    <TD><FONT STYLE="font: 10pt Times New Roman, Times, Serif">9.</FONT></TD>
    <TD><FONT STYLE="font: 10pt Times New Roman, Times, Serif">SOLE DISPOSITIVE POWER</FONT></TD>
    <TD>&nbsp;</TD></TR>
<TR>
    <TD STYLE="text-align: left"><FONT STYLE="font: 10pt Times New Roman, Times, Serif">PERSON</FONT></TD>
    <TD>&nbsp;</TD>
    <TD>&nbsp;</TD>
    <TD>&nbsp;</TD></TR>
<TR>
    <TD STYLE="text-align: left"><FONT STYLE="font: 10pt Times New Roman, Times, Serif">WITH</FONT></TD>
    <TD STYLE="border-bottom: black 1pt solid">&nbsp;</TD>
    <TD STYLE="border-bottom: black 1pt solid"><FONT STYLE="font: 10pt Times New Roman, Times, Serif">273,349<SUP>1 </SUP></FONT></TD>
    <TD STYLE="border-bottom: black 1pt solid">&nbsp;</TD></TR>
<TR>
    <TD STYLE="text-align: left">&nbsp;</TD>
    <TD><FONT STYLE="font: 10pt Times New Roman, Times, Serif">10.</FONT></TD>
    <TD><FONT STYLE="font: 10pt Times New Roman, Times, Serif">SHARED DISPOSITIVE POWER</FONT></TD>
    <TD>&nbsp;</TD></TR>
<TR>
    <TD STYLE="text-align: left">&nbsp;</TD>
    <TD>&nbsp;</TD>
    <TD>&nbsp;</TD>
    <TD>&nbsp;</TD></TR>
<TR>
    <TD STYLE="border-bottom: black 1pt solid; text-align: left">&nbsp;</TD>
    <TD STYLE="border-bottom: black 1pt solid">&nbsp;</TD>
    <TD STYLE="border-bottom: black 1pt solid"><FONT STYLE="font: 10pt Times New Roman, Times, Serif">537,618<SUP>2</SUP></FONT></TD>
    <TD STYLE="border-bottom: black 1pt solid">&nbsp;</TD></TR>
</TABLE>
<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0"></P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0"></P>

<TABLE CELLSPACING="0" CELLPADDING="0" STYLE="font: 10pt Times New Roman, Times, Serif; width: 100%">
<TR>
    <TD STYLE="width: 5%"><FONT STYLE="font: 10pt Times New Roman, Times, Serif">11.</FONT></TD>
    <TD STYLE="width: 88%"><FONT STYLE="font: 10pt Times New Roman, Times, Serif">AGGREGATE AMOUNT BENEFICIALLY OWNED BY EACH REPORTING PERSON</FONT></TD>
    <TD STYLE="width: 7%">&nbsp;</TD></TR>
<TR>
    <TD>&nbsp;</TD>
    <TD>&nbsp;</TD>
    <TD>&nbsp;</TD></TR>
<TR>
    <TD STYLE="border-bottom: black 1pt solid">&nbsp;</TD>
    <TD STYLE="border-bottom: black 1pt solid"><FONT STYLE="font: 10pt Times New Roman, Times, Serif">810,967<SUP>3</SUP></FONT></TD>
    <TD STYLE="border-bottom: black 1pt solid">&nbsp;</TD></TR>
<TR>
    <TD><FONT STYLE="font: 10pt Times New Roman, Times, Serif">12.</FONT></TD>
    <TD><FONT STYLE="font: 10pt Times New Roman, Times, Serif">CHECK BOX IF THE AGGREGATE AMOUNT IN ROW (11) EXCLUDES CERTAIN SHARES</FONT></TD>
    <TD>&nbsp;</TD></TR>
<TR>
    <TD>&nbsp;</TD>
    <TD>&nbsp;</TD>
    <TD><FONT STYLE="font: 10pt Wingdings 2">&pound;</FONT><FONT STYLE="font-family: Times New Roman, Times, Serif">&nbsp;</FONT></TD></TR>
<TR>
    <TD STYLE="border-bottom: black 1pt solid">&nbsp;</TD>
    <TD STYLE="border-bottom: black 1pt solid">&nbsp;</TD>
    <TD STYLE="border-bottom: black 1pt solid">&nbsp;</TD></TR>
<TR>
    <TD><FONT STYLE="font: 10pt Times New Roman, Times, Serif">13.</FONT></TD>
    <TD><FONT STYLE="font: 10pt Times New Roman, Times, Serif">PERCENT OF CLASS REPRESENTED BY AMOUNT IN ROW (11)</FONT></TD>
    <TD>&nbsp;</TD></TR>
<TR>
    <TD>&nbsp;</TD>
    <TD>&nbsp;</TD>
    <TD>&nbsp;</TD></TR>
<TR>
    <TD STYLE="border-bottom: black 1pt solid">&nbsp;</TD>
    <TD STYLE="border-bottom: black 1pt solid"><FONT STYLE="font: 10pt Times New Roman, Times, Serif">8.9%<SUP>4</SUP></FONT></TD>
    <TD STYLE="border-bottom: black 1pt solid">&nbsp;</TD></TR>
<TR>
    <TD><FONT STYLE="font: 10pt Times New Roman, Times, Serif">14.</FONT></TD>
    <TD><FONT STYLE="font: 10pt Times New Roman, Times, Serif">TYPE OF REPORTING PERSON*</FONT></TD>
    <TD>&nbsp;</TD></TR>
<TR>
    <TD>&nbsp;</TD>
    <TD>&nbsp;</TD>
    <TD>&nbsp;</TD></TR>
<TR>
    <TD STYLE="border-bottom: black 1pt solid">&nbsp;</TD>
    <TD STYLE="border-bottom: black 1pt solid"><FONT STYLE="font: 10pt Times New Roman, Times, Serif">IN&nbsp;</FONT></TD>
    <TD STYLE="border-bottom: black 1pt solid">&nbsp;</TD></TR>
</TABLE>
<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0">&nbsp;</P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0"></P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0"></P>

<TABLE CELLPADDING="0" CELLSPACING="0" WIDTH="100%" STYLE="font: 10pt Times New Roman, Times, Serif; margin-top: 0pt; margin-bottom: 0pt"><TR STYLE="vertical-align: top">
<TD STYLE="width: 0.25in"></TD><TD STYLE="width: 0.25in">1.</TD><TD>Includes 89,859 shares of Common Stock issuable under immediately exercisable Warrants.</TD></TR></TABLE>

<TABLE CELLPADDING="0" CELLSPACING="0" WIDTH="100%" STYLE="font: 10pt Times New Roman, Times, Serif; margin-top: 0pt; margin-bottom: 0pt"><TR STYLE="vertical-align: top">
<TD STYLE="width: 0.25in"></TD><TD STYLE="width: 0.25in">2.</TD><TD>Includes (A) 3,593 shares of Common Stock held of record by Integrated Surgical Systems (&ldquo;ISS&rdquo;), of which the Reporting
Person is Chief Executive Officer and one of four directors; and (B) 289,207 shares of Common Stock and 244,818 shares of Common
Stock issuable under immediately exercisable Warrants held of record by MDB Capital Group LLC (&ldquo;MDB&rdquo;), of which the
Reporting Person is Chief Executive Officer. The Reporting Person disclaims beneficial ownership of (A) the 3,593 shares of Common
Stock held of record by ISS, and (B) the 289,207 shares of Common Stock and the 244,818 shares of Common Stock issuable under immediately
exercisable Warrants held of record by MDB, except, in each case, to the extent of his pecuniary interest therein.</TD></TR></TABLE>

<TABLE CELLPADDING="0" CELLSPACING="0" WIDTH="100%" STYLE="font: 10pt Times New Roman, Times, Serif; margin-top: 0pt; margin-bottom: 0pt"><TR STYLE="vertical-align: top">
<TD STYLE="width: 0.25in"></TD><TD STYLE="width: 0.25in">3.</TD><TD>Includes 334,677 shares of Common Stock issuable under immediately exercisable Warrants.</TD></TR></TABLE>

<TABLE CELLPADDING="0" CELLSPACING="0" WIDTH="100%" STYLE="font: 10pt Times New Roman, Times, Serif; margin-top: 0pt; margin-bottom: 0pt"><TR STYLE="vertical-align: top">
<TD STYLE="width: 0.25in"></TD><TD STYLE="width: 0.25in">4.</TD><TD>Based on 8,782,015 shares of the Common Stock of the issuer currently outstanding.</TD></TR></TABLE>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0">&nbsp;</P>



<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0"></P>



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<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0">&nbsp;</P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0">&nbsp;</P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0"></P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0">This Amendment No. 3 to Schedule 13D (this &ldquo;Amendment&rdquo;)
amends and restates the Schedule 13D originally filed by Christopher Marlett (the &ldquo;Reporting Person&rdquo;) with the Securities
and Exchange Commission (the &ldquo;SEC&rdquo;) on May 1, 2012, as amended (as amended, this &ldquo;Schedule 13D&rdquo;). The purpose
of this Amendment is to reflect the prior allocations of warrants initially issued to MDB that could not be exercised prior to
April 24, 2013, and to reflect the current exercisability of those allocated warrants commencing April 24, 2013.</P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0">&nbsp;</P>

<TABLE CELLPADDING="0" CELLSPACING="0" WIDTH="100%" STYLE="font: 10pt Times New Roman, Times, Serif; margin-top: 0pt; margin-bottom: 0pt"><TR STYLE="vertical-align: top">
<TD STYLE="width: 0"></TD><TD STYLE="width: 1in">ITEM 1.</TD><TD>Security and Issuer</TD></TR></TABLE>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0">&nbsp;</P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0">The class of equity securities to which this Schedule 13D relates
is shares of common stock (the &ldquo;Common Stock&rdquo;) of ClearSign Combustion Corporation, a Washington corporation (the &ldquo;Issuer&rdquo;).
The principal executive office of the Issuer is 12870 Interurban Avenue South, Seattle, Washington 98168.</P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0">&nbsp;</P>

<TABLE CELLPADDING="0" CELLSPACING="0" WIDTH="100%" STYLE="font: 10pt Times New Roman, Times, Serif; margin-top: 0pt; margin-bottom: 0pt"><TR STYLE="vertical-align: top">
<TD STYLE="width: 0"></TD><TD STYLE="width: 1in">ITEM 2.</TD><TD>Identity and Background.</TD></TR></TABLE>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0">&nbsp;</P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0">(a)&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;This Schedule 13D is being filed by Christopher Marlett.</P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0">&nbsp;</P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0">(b)&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;The Reporting Person&rsquo;s business address is 401
Wilshire Blvd., Santa Monica, California 90401.</P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0">&nbsp;</P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0">(c)&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;The Reporting Person principal occupation is Chief Executive
Officer of MDB Capital Group, LLC, an investment banking firm.</P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0">&nbsp;</P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0">(d)&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;During the past five years, the Reporting Person has
not been convicted in a criminal proceeding (excluding traffic violations or similar misdemeanors).</P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0">&nbsp;</P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0">(e)&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;During the past five years, none of the Reporting Person
has not been a party to a civil proceeding of a judicial or administrative body of competent jurisdiction or as a result of such
a proceeding was or is subject to a judgment, decree or final order enjoining future violations of, or prohibiting or mandating
activities subject to, federal or state securities laws or finding any violation with respect to such laws.</P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0">&nbsp;</P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0">(f)&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;The Reporting Person is a citizen of the United States.</P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0">&nbsp;</P>

<TABLE CELLPADDING="0" CELLSPACING="0" WIDTH="100%" STYLE="font: 10pt Times New Roman, Times, Serif; margin-top: 0pt; margin-bottom: 0pt"><TR STYLE="vertical-align: top">
<TD STYLE="width: 0"></TD><TD STYLE="width: 1in">ITEM 3.</TD><TD>Source and Amount of Funds and Other Consideration.</TD></TR></TABLE>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0">&nbsp;</P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0">The securities were acquired by the Reporting Person through
the use of personal funds and provisions of services.</P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0">&nbsp;</P>

<TABLE CELLPADDING="0" CELLSPACING="0" WIDTH="100%" STYLE="font: 10pt Times New Roman, Times, Serif; margin-top: 0pt; margin-bottom: 0pt"><TR STYLE="vertical-align: top">
<TD STYLE="width: 0"></TD><TD STYLE="width: 1in">ITEM 4.</TD><TD>Purpose of Transaction</TD></TR></TABLE>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0">&nbsp;</P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0">The securities were acquired for investment purposes. The Reporting
Person intends to review his investment in the Issuer on a continuing basis and will routinely monitor a wide variety of investment
considerations, including, without limitation, current and anticipated future trading prices for the Common Stock, the Issuer&rsquo;s
financial position, operations, assets, prospects, strategic direction and business and other developments affecting the Issuer.
The Reporting Person may from time to time take such actions with respect to his investment in the Issuer as he deems appropriate,
including, without limitation, (i) acquiring additional shares or disposing of some or all of his shares of Common Stock (or other
securities of the Issuer); (ii) changing his current intentions with respect to any or all matters referred to in this Item 4;
and/or (iii) engaging in hedging, derivative or similar transactions with respect to any securities of the Issuer. Any acquisition
or disposition of the Issuer&rsquo;s securities may be made by means of open-market purchases or dispositions, privately negotiated
transactions, direct acquisitions from or dispositions to the Issuer.</P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0">&nbsp;</P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0"></P>

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<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0">&nbsp;</P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0">&nbsp;</P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0">At the date of this Schedule 13D, except as set forth in this
Schedule 13D, the Reporting Person does not have any plans or proposals which would result in:</P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0">&nbsp;</P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin-top: 0; margin-bottom: 0; margin-left: 0; text-indent: 0.5in; text-align: justify">(a)&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;The
acquisition by any person of additional securities of the Issuer, or the disposition of securities of the Issuer;</P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0">&nbsp;</P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin-top: 0; margin-bottom: 0; margin-left: 0; text-indent: 0.5in; text-align: justify">(b)&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;An extraordinary corporate transaction, such as a
merger, reorganization or liquidation, involving the Issuer or any of its subsidiaries;</P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0">&nbsp;</P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin-top: 0; margin-bottom: 0; margin-left: 0; text-indent: 0.5in; text-align: justify">(c)&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;A sale or transfer of a material amount of assets
of the Issuer or any of its subsidiaries;</P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0">&nbsp;</P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin-top: 0; margin-bottom: 0; margin-left: 0; text-indent: 0.5in; text-align: justify">(d)&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;Any change in the present board of directors or management
of the Issuer, including any plans or proposals to change the number or term of directors or fill any existing vacancies on the
board;</P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0">&nbsp;</P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin-top: 0; margin-bottom: 0; margin-left: 0; text-indent: 0.5in; text-align: justify">(e)&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;Any material change in the present capitalization
or dividend policy of the Issuer;</P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0">&nbsp;</P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin-top: 0; margin-bottom: 0; margin-left: 0; text-indent: 0.5in; text-align: justify">(f)&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;Any other material change in the Issuer&rsquo;s business
or corporate structure;</P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0">&nbsp;</P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin-top: 0; margin-bottom: 0; margin-left: 0; text-indent: 0.5in; text-align: justify">(g)&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;Changes in the Issuer&rsquo;s charter, bylaws or
instruments corresponding thereto or other actions which may impede the acquisition of control of the Issuer by any person;</P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0">&nbsp;</P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin-top: 0; margin-bottom: 0; margin-left: 0; text-indent: 0.5in; text-align: justify">(h)&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;Causing a class of securities of the Issuer to be
delisted from a national securities exchange or to cease to be authorized to be quoted in an inter-dealer quotation system of a
registered national securities association;</P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0">&nbsp;</P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin-top: 0; margin-bottom: 0; margin-left: 0; text-indent: 0.5in; text-align: justify">(i)&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;A class of equity securities of the Issuer becoming
eligible for termination of registration pursuant to Section 12(g)(4) of the Securities Exchange Act of 1940; or</P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0">&nbsp;</P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-indent: 0.5in">(j)&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;Any action similar to any of those
actions enumerated above.</P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0">&nbsp;</P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0"></P>

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<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0">&nbsp;</P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0">&nbsp;</P>





<TABLE CELLPADDING="0" CELLSPACING="0" WIDTH="100%" STYLE="font: 10pt Times New Roman, Times, Serif; margin-top: 0pt; margin-bottom: 0pt"><TR STYLE="vertical-align: top">
<TD STYLE="width: 0"></TD><TD STYLE="width: 1in">ITEM 5.</TD><TD>Interests in Securities of the Issuer</TD></TR></TABLE>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0"><B>&nbsp;</B></P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0">(a)&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;The Reporting Person beneficially owns an aggregate of
810,967 shares of Common Stock, representing 8.9% of the Issuer&rsquo;s Common Stock. This percentage is based upon an aggregate
of 8,782,015 outstanding shares of the Issuer&rsquo;s Common Stock, as provided by the Issuer to the Reporting Person.</P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0">&nbsp;</P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0">(b)&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;The Reporting Person has (A) the sole power to vote and
to dispose of 273,349 shares of Common Stock and (B) the shared power to vote, or to direct the vote, or to dispose, or direct
the disposition, of 537,618 shares of Common Stock. The Reporting Person disclaims beneficial ownership of the 537,618 shares of
Common Stock over which he has the shared power to vote, or to direct the vote, or to dispose, or direct the disposition, except
to the extent of his pecuniary interest therein.</P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0">&nbsp;</P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0">(c)&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;Not applicable.</P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-indent: 0.5in">&nbsp;</P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0">(d)&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;Not applicable</P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0">&nbsp;</P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0">(e)&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;Not applicable.</P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0">&nbsp;</P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0">&nbsp;</P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0">&nbsp;</P>

<TABLE CELLPADDING="0" CELLSPACING="0" WIDTH="100%" STYLE="font: 10pt Times New Roman, Times, Serif; margin-top: 0pt; margin-bottom: 0pt"><TR STYLE="vertical-align: top">
<TD STYLE="width: 0"></TD><TD STYLE="width: 1in">ITEM 6.</TD><TD>CONTRACTS, ARRANGEMENTS UNDERSTANDINGS OR RELATIONSHIPS WITH RESPECT TO SECURITIES OF THE ISSUER.</TD></TR></TABLE>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0 0pt 63pt; text-indent: -63pt">&nbsp;</P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0">Warrant to Purchase Shares of Common Stock (incorporated herein
by reference to Exhibit 4.2 of the Issuer&rsquo;s Registration Statement on Form S-1 (File No. 333-177946), filed with the SEC
on November 14, 2011).</P>

<P STYLE="font: bold 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-align: center">&nbsp;</P>

<P STYLE="font: bold 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-align: center">&nbsp;</P>

<TABLE CELLPADDING="0" CELLSPACING="0" WIDTH="100%" STYLE="font: 10pt Times New Roman, Times, Serif; margin-top: 0pt; margin-bottom: 0pt"><TR STYLE="vertical-align: top">
<TD STYLE="width: 0"></TD><TD STYLE="width: 1in">ITEM 7.</TD><TD>MATERIAL TO BE FILED AS EXHIBITS.</TD></TR></TABLE>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0 0pt 63pt; text-indent: -63pt">&nbsp;</P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0">Not applicable.</P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0">&nbsp;</P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0">&nbsp;</P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0">&nbsp;</P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0">&nbsp;</P>

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<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0">&nbsp;</P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0">&nbsp;</P>

<P STYLE="font: bold 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-align: center">SIGNATURE</P>

<P STYLE="font: bold 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-align: center">&nbsp;</P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0">&nbsp;</P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-indent: 0.5in">After reasonable inquiry and to the best
of my knowledge and belief, I certify that the information set forth in this statement is true, complete and correct.</P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0">&nbsp;</P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0">Dated as of: February 25, 2013</P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0">&nbsp;</P>

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<TR STYLE="vertical-align: top">
    <TD STYLE="width: 50%; font-size: 10pt">&nbsp;</TD>
    <TD STYLE="width: 50%; font-size: 10pt"><U>/s/ Christopher Marlett</U></TD></TR>
<TR STYLE="vertical-align: top">
    <TD STYLE="font-size: 10pt">&nbsp;</TD>
    <TD STYLE="font-size: 10pt">Christopher Marlett</TD></TR>
</TABLE>
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<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0 0pt 3.5in">&nbsp;</P>



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